20   void (*crcfunc)(struct deflate *dd, char *data, unsigned len);
138 static void output_byte(struct deflate *dd, char sym)  in output_byte()  argument
140   int pos = dd->pos++ & 32767;  in output_byte()
142   dd->data[pos] = sym;  in output_byte()
145     xwrite(dd->outfd, dd->data, 32768);  in output_byte()
146     if (dd->crcfunc) dd->crcfunc(dd, dd->data, 32768);  in output_byte()
202 static void inflate(struct deflate *dd, struct bitbuf *bb)  in inflate()  argument
204   dd->crc = ~0;  in inflate()
233         while (pos--) output_byte(dd, *(p++));  in inflate()
284         lithuff = dd->fixlithuff;  in inflate()
285         disthuff = dd->fixdisthuff;  in inflate()
293         if (sym < 256) output_byte(dd, sym);  in inflate()
300           len = dd->lenbase[sym] + bitbuf_get(bb, dd->lenbits[sym]);  in inflate()
302           dist = dd->distbase[sym] + bitbuf_get(bb, dd->distbits[sym]);  in inflate()
303           sym = dd->pos & 32767;  in inflate()
305           while (len--) output_byte(dd, dd->data[(dd->pos-dist) & 32767]);  in inflate()
316   if (dd->pos & 32767) {  in inflate()
317     xwrite(dd->outfd, dd->data, dd->pos&32767);  in inflate()
318     if (dd->crcfunc) dd->crcfunc(dd, dd->data, dd->pos&32767);  in inflate()
324 static void deflate(struct deflate *dd, struct bitbuf *bb)  in deflate()  argument
326   char *data = dd->data;  in deflate()
329   dd->crc = ~0;  in deflate()
333     len = readall(dd->infd, data+(dd->len&32768), 32768);  in deflate()
336     if (dd->crcfunc) dd->crcfunc(dd, data+(dd->len&32768), len);  in deflate()
348     while (dd->pos != dd->len) {  in deflate()
349       unsigned pos = dd->pos&65535;  in deflate()
354       if (!(32767 & ++dd->pos) && !final) break;  in deflate()
364   struct deflate *dd = xmalloc(sizeof(struct deflate)+32768*(compress ? 4 : 1));  in init_deflate()  local
366   memset(dd, 0, sizeof(struct deflate));  in init_deflate()
369     dd->hashhead = (unsigned short *)(dd->data+65536);  in init_deflate()
370     dd->hashchain = (unsigned short *)(dd->data+65536+32768);  in init_deflate()
374   *dd->lenbase = 3;  in init_deflate()
375   for (i = 0; i<sizeof(dd->lenbits)-1; i++) {  in init_deflate()
378         dd->lenbits[i]++;  in init_deflate()
382       else dd->lenbits[i+1] = dd->lenbits[i];  in init_deflate()
384     dd->lenbase[i+1] = n + dd->lenbase[i];  in init_deflate()
387   for (i = 0; i<sizeof(dd->distbits); i++) {  in init_deflate()
388     dd->distbase[i] = 1<<n;  in init_deflate()
389     if (i) dd->distbase[i] += dd->distbase[i-1];  in init_deflate()
391     dd->distbits[i] = n;  in init_deflate()
397   len2huff(dd->fixlithuff = ((struct huff *)libbuf)+3, libbuf, 288);  in init_deflate()
399   len2huff(dd->fixdisthuff = ((struct huff *)libbuf)+4, libbuf, 30);  in init_deflate()
401   return dd;  in init_deflate()
423 void gzip_crc(struct deflate *dd, char *data, unsigned len)  in gzip_crc()  argument
426   unsigned crc, *crc_table = dd->crctable;  in gzip_crc()
428   crc = dd->crc;  in gzip_crc()
430   dd->crc = crc;  in gzip_crc()
431   dd->len += len;  in gzip_crc()
450   struct deflate *dd = init_deflate(1);  in gzip_fd()  local
458   dd->infd = infd;  in gzip_fd()
462   crc_init(dd->crctable, 1);  in gzip_fd()
463   dd->crcfunc = gzip_crc;  in gzip_fd()
465   deflate(dd, bb);  in gzip_fd()
470   bitbuf_put(bb, ~dd->crc, 32);  in gzip_fd()
471   bitbuf_put(bb, dd->len, 32);  in gzip_fd()
472   rc = dd->len;  in gzip_fd()
476   free(dd);  in gzip_fd()
484   struct deflate *dd = init_deflate(0);  in gunzip_fd()  local
488   crc_init(dd->crctable, 1);  in gunzip_fd()
489   dd->crcfunc = gzip_crc;  in gunzip_fd()
490   dd->outfd = outfd;  in gunzip_fd()
495     inflate(dd, bb);  in gunzip_fd()
499     if (~dd->crc != bitbuf_get(bb, 32) || dd->len != bitbuf_get(bb, 32))  in gunzip_fd()
501     rc += dd->len;  in gunzip_fd()
504     dd->pos = dd->len = 0;  in gunzip_fd()
507   free(dd);  in gunzip_fd()